It is typically more of a refinement technique...so that means your trunk and primary branches are already where you want them.I just looked up this technique and found an interesting long thread which appeared to get pretty heated. Read through part of it and found his blog page about it. Something to consider as it actually makes sense vs reading about alternative techniques including pinching etc. one thing I’m not sure about this technique is if it applies to smaller developing trees or just larger ones to build ramification. Will continue to read about this.